Barros, S. C. C., Marsh, T. R., Groot, P. J. (Paul J.), Nelemans, G., Ramsay, G. (Gavin), Roelofs, Gijs H. A., Steeghs, D. (Danny), 1972- and Wilms, J. (2005) Geometrical constraints upon the unipolar model of V407 Vul and RX J0806.3+1527. In: Conference on Astrophysics of Cataclysmic Variables and Related Objects, Strasbourg, France, JUL 11-16, 2004. Published in: Astrophysics of Cataclysmic Variables and Related Objects, Vol.330 pp. 331-332.

Abstract

V407 Vul and RX J0806.3+1527 are X-ray emitting stars with Xray light curves 100% modulated on periods of 569 and 321 seconds respectively. These are the only periods seen, and are thought to be the orbital periods of ultra-compact pairs of white dwarfs. There are two main double white dwarf models: the unipolar inductor model analogous to the Jupiter-Io system and the direct impact model analogous to Algol. We consider geometrical constraints on the unipolar inductor model, in particular what parameter values (component masses, orbital inclination i and magnetic co-latitude beta) can fit the X-ray and optical light curves.

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